Uneven Coal Burn in an EFM 520

Uneven coal burn in an EFM 520

PostBy: winter clove inn On: Sun Dec 26, 2010 9:55 pm

I recently fired my EFM 520, it burns great for up to 12 hours. Then I notice the dark coal in the center starts expanding toward one side.About a 3'' wide strip of unburned coal reaches the edge and falls into the ashpit.I am running 6 teeth on the coal feed and between 5 and 6 on the air.
thanks in advance for your help, Bud
winter clove inn
Stove/Furnace Make: efm
Stove/Furnace Model: 520

Re: Uneven coal burn in an EFM 520

PostBy: Short Bus On: Sun Dec 26, 2010 10:21 pm

You might repost this in the manufacturers forum. But I'm sure answers will flow here, since you have fuel and heat I would guess it's an air problem, maybe the holes in the tulip that the coal and air mix in are pluged, EFM also seams to have a rod or lever for droping the ash out from the chamber below the grate or tulip.

Problem area might be visible in this link
Pictorial: The Burner Pot Assembly w/part numbers
Short Bus
Stoker Coal Boiler: Kewanee boiler with Anchor stoker
Coal Size/Type: Chestnut / Sub-bituminous C
Other Heating: Propane wall furnace back up only

Re: Uneven coal burn in an EFM 520

PostBy: Rob R. On: Sun Dec 26, 2010 10:28 pm

Hi Bud, is this the first time you have used this unit? Sounds like a worn auger and/or a burner plate issue. I would start by shutting it down, and cleaning out the pot. Then you can inspect the different components. Check the auger for sharp edges, try and move it around to see how much play there is, make sure the burner plates are intact, and that the airflow isn't blocked with fines.

Rob R.
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Uneven coal burn in an EFM 520

PostBy: CoalHeat On: Sun Dec 26, 2010 10:32 pm

Moved topic to the EFM forum.
Check for clogged holes or a damaged grate section or two. Did you pull the fines lever? Did it make a difference?
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Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Baseburners & Antiques: Sears Signal Oak 15 & Andes Kitchen Range
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert

Re: Uneven coal burn in an EFM 520

PostBy: stoker-man On: Sun Dec 26, 2010 11:01 pm

I'm with these guys. It's something wrong with the burner plate itself or a fines build-up underneath and possibly the worm, but not likely.
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove